The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
"Contains the tariff acts of 1897, 1894, 1890, and 1883, complete, except certain provisions relating to internal revenue and other matters not germane to this work, and also the customs administrative act of 1890." cf. Prefatory note, p. 3